Dom Sagolla is the author of 140 Characters, a style guide for the short form. He's also the founder of DollarApp, an app studio that produces a variety of 99 cent apps for the iPhone; and a co-founder of iPhoneDevCamp, an international, not-for-profit developer conference for the iPhone community. iPhoneDevCamp 3 was hosted here at Yahoo! in July 2009, which is how YDN met Dom.

Dom describes the early days of Twitter, the epiphany that they could change the world with 140 characters, and the birth of his new book.

A video profile of Victor Tsaran, Yahoo!'s Accessibility Program manager, as seen yesterday in a cnet news piece, Web accessibility no longer an afterthought, and over the weekend at TED Silicon Valley. (This video portrait originally appeared on Yodel Anecdotal, Yahoo!'s corporate blog.)

In this video, Sanjay Radia from Yahoo!'s Hadoop team describes the new File System API. The slides from his talk are in the blog post recapping the meeting. This talk is from the November 18 Hadoop User Group meetup, held at Yahoo!’s Sunnyvale campus, and was the second of three talks given that evening. Video from the first talk, “Search at Scale” is also posted on this blog.

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Now that the metadata-rich Semantic Web (or "Linked Data" web) is here, we're finding many new ways to connect ideas together and using that data in new and exciting ways. In this session we'll avoid big-picture predictions and focus on the nitty-gritty--exactly how people and organizations are working to link their data together, with an emphasis on the nuts and bolts--the programming languages, databases, and techniques that make the Semantic Web a reality.

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Originally recorded on October 9, 2009. With the quickly changing social web landscape, web publishers and developers face real choices in how much to invest in the social web, what features to present to users, and specifically what and how to integrate. In addition, an ecosystem of 3rd-party technology providers is emerging around it, offering the potential for easier integrations and one-stop shopping. This panel, moderated by Yahoo's Greg Cohn, will feature an overview from several companies integrating Yahoo! social technologies into their offerings, as well as a discussion on the practical and business aspects.

Alex Lines is "hacker in residence" at Betaworks. Yahoo Developer Network caught up with him in Manhattan's Madison Square Park on a breezy autumn day last month. Alex spoke about some of the things he learned from building Path 101 with co-founder Charlie O'Donnell, and about the new technologies and trends that are grabbing his attention now.

He mentions the new "No SQL" space: non-relational key value stores, distributed hash tables, products like Tokyo Cabinet, Cassandra, Voldemort, and others. He's also paying attention to core infrastructure for scaling the web, asynchronous queue servers like Gearman, and talks about the power of real-time data, like the value of location data that emerges from services like FourSquare, once you provide a social filter for context and relevance.

Brandon Kessler is founder of and CEO of ChallengePost, a marketplace for hosting online software development and problem-solving challenges. Here, he explains why he founded ChallengePost, and describes the NYC Big Apps challenge, a competition for developing applications for the city of New York based on the open government data which the city released back in October.